h1,h2,h3,h4{
    margin: 0;
    font-weight: normal;
}
span,div,body,img{
    margin: 0;
    padding: 0;
}
ul{
    list-style: none;
    margin: 0;
    padding: 0;
}
a{
    margin: 0;
    text-decoration-line: none;
    padding: 0;
}
body{
    background-color: #f7f8fa;
    color:#3c3c3c;
    font: 12px/1.5 tahoma, arial, 'Hiragino Sans GB', '\5b8b\4f53', sans-serif;

}
.fl{
    float: left;
}
.fr{
    float: right;
}
.bc1{
    background-color: #fb6f00;
}
.bc2{
    background-color: #158eff;
}
.bc3{
    background-color: #fed500;
}
.bc4{
    background-color: #2dc975;
}